Phases of soil investigation

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The phases of Soil Investigation

1. PHASE -I (Desk Study)
2. PHASE -II (Preliminary Reconnaissance)
3. PHASE -III (Detailed Soil Exploration)
4. PHASE -IV (Laboratory Testing)
5. PHASE -V (Write a report)


For Full Course visit our website
https://www.machenlink.com/course/foundation-engineering/

1. Phases of Soil
Investigation
FOUNDATION ENGINEERING

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3.Earth Pressure 4. Bearing Capacity
5. Shallow Foundation 6. Pile Foundation
2. Stability of Slopes
CURRICULUM
1. Sub -Surface Investigation

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IMPORTANCE & OBJECTIVE
•The stabilityand costs of civil engineering works influenced by
inhomogeneous and discontinuous formations of soil by
geological forces and process.
•The soil investigation is necessary to ,…
i.Characterize site economically
ii.The type and methods of construction
iii.Natural geological hazards (i.e. Earthquakes, volcanic
activity, and ground water conditions)
•A soils investigation is an essential part of the design and
construction of a proposed structural system (buildings, dams,
roads and highways, etc.).
•We have to make estimates and judgements based on
information and from a limited set of observations and from
field and laboratory test data for performance and costs of
structure constructed at a site.
The objective of site exploration is to provide reliable, specific and detailed information about the soil and ground water
conditions of the site which may be required for a safe and economic design and execution of the engineering work.

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CONTENT

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PHASE OF SOIL INVESTIGATION
The scope of a soils investigation depends on
•Type,
•Size, and
•Importance of the structure
•The client•The engineer’s
familiarity with the
soils at the site
•Local building codes
It is mandatory that a visit be made to the proposed site.

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PHASE -I (DESK STUDY)
It involves collection of available information such as,…
•A site plan
•Type, size, and importance of the structure
•Loading conditions
•Previous geotechnical reports
•Maps
•Topographic maps,
•Aerial photographs,
•Still photographs,
•Satellite imagery, and
•Geologic maps
Geographical Information System (GIS)
An integration of software, hardware, and digital data.
•Capture,
•Manage,
•Analyse and
•Display
spatial information
Spatial information can be used to view, share,
understand, question, interpret, and visualize data in
ways that reveal relationships, patterns, and trends.
Google
Earth
can be used to view,…
•satellite imagery,
•maps,
•terrain, and
•3D structures.
You can also create project
maps using Google Earth.

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PHASE -II (PRILIMINARY RECONNAISSANCE)
Preliminary reconnaissance or a site visit to provide a general picture of the topography and geology of the site.
•Photographs of the site and its neighbourhood.
•Access to the site for workers and equipment.
•Sketches of all fences, utility posts, driveways, walkways, drainage systems, and so on.
•Utility services that are available, such as water and electricity.
•Sketches of topography including all existing structures, cuts, fills, ground depression, ponds, and so on.
•The state of any existing building at the site or nearby. Your notes should include exterior and interior
cracks, any noticeable tilt, type of construction, evidence of frost damage, moulds, and any exceptional
features.
•Geological features from any exposed area such as a road cut.
•Occasionally, a few boreholes may be dug to explore the site.
Your site visit notes should include the following:

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PHASE -III (DETAILED SOIL EXPLORATION)
The objectives of a detailed soils exploration are:
•Todeterminethegeologicalstructure,whichshould
includethethickness,sequence,andextentofthesoil
strata.
•Todeterminethegroundwaterconditions.
•Toobtaindisturbedandundisturbedsamplesfor
laboratorytests.
•Toconductinsitutests.
•Thefieldtestmaybeconductedfordeterminingthein
–situvaluesofdensity,bearingcapacity,shear
strength,permeability,andporepressures.

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PHASE -IV(LABORATORY TESTING)
•To classify the soils.
•To determine
•soil strength,
•failure stresses and strains,
•stress–strain response,
•permeability,
•compactibility, and
•settlement parameters.
Not all of these may be required for a project

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PHASE -V(WRITE A REPORT)
•The report must contain a clear description of the soils at the site,
•Methods of exploration,
•Soil stratigraphy,
•In situ and laboratory test methods and results, and
•The location of the groundwater.